Detection technology of high temperature cooking r

2022-08-17
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High temperature cooking detection technology of packaging bags

high temperature cooking food has become the preferred packaging for meat and bean products in recent years because of its convenience in eating, portability, long storage life at room temperature and many other advantages

since the packaging bag must be able to withstand 135 ℃ high-temperature cooking and sterilization conditions (sterilization at 135 ℃ for 30~40min.: it can basically kill all bacteria, so as to achieve the purpose of long-term preservation of food under non refrigerated conditions), how to test the high-temperature cooking performance of the packaging bag, that is, how to test the packaging at various temperature stages, has always been a problem that the industry pays attention to. The following details:

I. detection equipment: zm-100 high temperature (back pressure) cooking pot

sterilization temperature: ℃; Disinfection barrel diameter: ¢ 400; Storage barrel volume: 50L; Working pressure range: 22Mpa (saturated steam pressure); Make up water pressure: ≥ 0.32mpa; Back pressure: 0 20MPa

II. Design principle: Based on the basic theory of medical high-temperature sterilization containers, two improved technologies are added:

1. The thermometer is separated from the pressure gauge, and a separate temperature control display is set. A separate temperature sensor is set in the working chamber, which is connected to the temperature display outside the equipment, so that the displayed temperature is not affected by the air partial pressure

2. Eliminate the influence of air through gas replacement. When a certain pressure is generated in the working chamber, start gas replacement, and use the pressure of steam to drive out the air. After several times of effective gas replacement, the air left in the silo can be reduced to less than 1%. Because: according to the inspection of authoritative departments, at 135 ℃, the maximum actual temperature is only 133.9 ℃, and the temperature difference reaches 1.1 ℃. The guiding significance of this conclusion for soft packaging enterprises is very limited

these two technologies completely solve the error between the temperature displayed by the external thermometer and the actual temperature, thus avoiding the possible misleading to the enterprise and the series error caused by the heat-resistant temperature of the detected ink, adhesive and film

III. The operation of the instrument refers to the final collection. When 366.5 is used as a material, the high molecular polymer is required to have the necessary mechanical properties and precautions:

1. Seal the upper cover

2. Turn on the power supply, set the temperature value and temperature holding time, and turn on the water tap

3. Press the test switch. At this time, if there is no water or lack of water in the barrel, the water replenishment indicator light (red) will be on, and the cooking pot will start to feed water at the same time. Until the water level is reached, the water replenishment indicator light will be off, the work indicator light will be on (yellow), and the equipment will start to heat. The whole sterilization operation will be carried out automatically until the end, and the timer displays "end"

note: for the sterilization of soft packed bags, in order to prevent the bag from cracking, it is recommended to close the lower exhaust valve at room temperature ~98 ℃ to maintain the balance between the air expansion pressure in the bag and the air expansion pressure in the barrel. At 98~100 ℃, properly open the lower exhaust valve to remove the air, and the exhaust degree is limited to the slight rise of the pressure (the pressure cannot be reduced, and the development of the rubber spring of the locomotive and vehicle running device cannot usually be guaranteed to be small through the operation experiment, otherwise the bag will break) until the temperature value on the pressure gauge corresponds to the pressure value, and then appropriately close the exhaust valve

4. After completion, start the compressor first. Adjust the pressure of the pressure reducing valve on the compressor to about 0.165 MPa. Note: the back pressure should not exceed 0.22 MPa, so be sure to check the pressure setting on the pressure reducing valve at any time

5. Connect the pressure gas output from the pressure reducing valve to the air supply port behind the cooking pot. When the pressure in the cooking pot is lower than 0.165 MPa, open the back pressure air valve to supplement the pressure until the temperature in the pot falls to normal temperature. At this time, the left drainage valve can be opened. In fact, the hot water is discharged, and the equipment automatically replenishes cold water, so that the cooling water can be automatically circulated to accelerate the cooling. Note: water can be replenished only when the power operation switch is at the starting position, and the water source pressure must be> 0.32 MPa. When the water pressure is too low, water cannot be replenished

6. When the temperature in the cooking pot drops to normal temperature, close the back pressure air supply valve, open the lower steam exhaust valve on the right side of the cooking pot, discharge air and water vapor, and close the valve again after discharge. When the pressure drops to normal pressure, open the lid of the pot, take out the disinfection items, open the drain valve on the left side of the cooking pot to drain the water, and close the valve again after draining the water

IV. summary

for flexible packaging, high-temperature cooking bags belong to products with high requirements, high investment and high added value. Compared with ordinary products, in addition to the testing of routine performance indicators of packaging bags, the following testing and evaluation should be carried out for raw materials and final products used in production according to the principle of quality critical control points:

ink, is it high-temperature resistant ink? If yes, what is the temperature resistance

adhesive, is it a high temperature resistant adhesive? If yes, what is the temperature resistance

whether each layer of structural film is high temperature resistant? If yes, what is the temperature resistance? Can its layer affect the final product

whether the final product can withstand high temperature according to the customer's requirements. If so, under what state? What is the temperature resistance

source: (Guangzhou standard international/Technology Development Department)

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